Here's another vote for the Mini-Beast II. I installed it in about 20 minutes.

 

I got a set of Rivco at Daytona last year for $165. Install was pretty straight forward on the 09 Ultra. Quite loud.

 

http://www.howardshorns.com/
Made here in the USA. Yes it matters.
Boycott chinese products!!

 

My vote is for the Propad mini Beast. I installed it last year at Sturgis at their vendor site at Blackhills Harley on my 07. I am a firm believer in a a air horn and use it often. I had the harley unit installed when I purchased the Bike and the Bracket Broke 3 times!!! I kept having them repair it cause it was still under extended warranty. Obviously bad design. I finally was fed up and tired of being without a horn while they ordered parts. I am totally happy with the propad and they said that they tested their bracket extensively and were aware of the Harley Brackets faults. You would think that MOCO would just make a better bracket!? Anyway, propad looks awesome and works great!!

 

Rivco...extremely high pitched and loud!

Bwana

 

I vote for BJ Specialties. Easy install and extremly loud
http://bjspecialties.com/harleytouringhorns.html

 

Do you have a link for them?

 

A good friend has the Wolo Bad boy. It does not have the actual trumpets as part of it but is loud loud enough to make you chit your pants.

 

+1 on stebel

 

I've been thinking about changing to this Kuryakyn air horn setup.